Android sd卡读取数据库实例代码

前言：

本文主要给大家讲解如何利用Android SD卡读取数据库，提供一些代码如下。先在 Manifest 里添加权限：

<span style="font-size:16px;"><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /></span>

然后在 mainActivity 添加方法

<span style="font-size:16px;">SQLiteDatabase db; private final String DATABASE_PATH = android.os.Environment .getExternalStorageDirectory().getAbsolutePath() + "/vote"; private String DATABASE_FILENAME = "db_vote.db"; // 初始化数据库 private SQLiteDatabase openDatabase() { try { String databaseFilename = DATABASE_PATH + "/" + DATABASE_FILENAME; File dir = new File(DATABASE_PATH); if (!dir.exists()) dir.mkdir(); if (!(new File(databaseFilename)).exists()) { InputStream is = getResources().openRawResource(R.raw.db_vote); FileOutputStream fos = new FileOutputStream(databaseFilename); byte[] buffer = new byte[8192]; int count = 0; while ((count = is.read(buffer)) > 0) { fos.write(buffer, 0, count); } fos.close(); is.close(); } db = SQLiteDatabase.openOrCreateDatabase(databaseFilename, null); return db; } catch (Exception e) { e.printStackTrace(); } return null; }</span>

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